// 操作共享变量会有问题的售票系统代码
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int ticket = 100;
void *route(void *arg) {
  char *id = (char *)arg;
  while (1) {
    if (ticket > 0) {
      usleep(1000);
      printf("%s sells ticket:%d\n", id, ticket);
      ticket--;
    } else {
      break;
    }
  }
}
int main(void) {
  pthread_t t1, t2, t3, t4;
  pthread_create(&t1, NULL, route, "thread 1");
  pthread_create(&t2, NULL, route, "thread 2");
  pthread_create(&t3, NULL, route, "thread 3");
  pthread_create(&t4, NULL, route, "thread 4");
  pthread_join(t1, NULL);
  pthread_join(t2, NULL);
  pthread_join(t3, NULL);
  pthread_join(t4, NULL);
}